|
 |
|||||
RESEARCH INTERESTS: Reproductive Physiology and Endocrinology RESEARCH SUMMARY: The broad goal of our research program is to improve reproductive efficiency of sheep. Studies on the female include artificial insemination, embryo survival, puberty, and seasonality of breeding for improving ewe productivity. Studies on the male include sexual behavior, sexual orientation, and influence of season. Through studies to understand basic relationships of endocrinology, neuroendocrinology and sexual behavior, we are investigating ways to improve female and male reproductive performance. The information from reproduction research is integrated with genetic, environmental, nutritional, and management factors through collaboration with a multi-disciplinary team.
REPRESENTATIVE PUBLICATIONS Alexander, B.M., J.N. Stellflug, J.D. Rose, J.A. Fitzgerald, and G.E. Moss (1999). Behavior and endocrine correlates related to exposure of heterosexual, low-performing, and male-oriented domestic rams to rams and ewes in estrus. J. Anim. Sci. 77:1869-1874. Hatfield, P, J.N. Stellflug, J.W. Walker, and R.W. Kott (1999). The effects of nutritional management on ewe body weight, ewe body composition, and kilograms of lamb weaned per ewe. Sheep and Goat Research J. 15:41-49. Pinckard, K.L., J.N. Stellflug, J.A Resko, C.E., Roselli, and F. Stormshak (2000). Review: brain aromatization and other factors affecting male reproductive behavior with emphasis on the sexual orientation of rams. Domestic Anim. Endo. 18:83-96. Pinckard, K.L., J.N. Stellflug, and F. Stormshak (2000). Influence of castration and estrogen replacement on sexual behavior of female-oriented, male-oriented, and asexual rams. J. Anim. Sci. 78:1947-1953. Alexander, B.M., J.D. Rose, J.N. Stellflug, J.A. Fitzgerald, and G.E. Moss (2001). Low-sexually performing rams but not male-oriented rams can be discriminated by cell size in the amygdala and preoptic area: A morphometric study. Behav. Brain Research. 119:15-21. Alexander, B.M., J.D. Rose, J.N. Stellflug, J.A. Fitzgerald, and G.E. Moss (2001). Fos-like immunoreactivity in brain regions of domestic rams following exposure to rams and ewes. Physiology and Behavior. 73:75-80. Perkins, A., J.A. Fitzgerald, V.A. LaVoie, and J.N. Stellflug (2001). Filed on May 27, 1999. "Method of Sire Selection Using Naloxone Challenge Test and Kits Thereof@ Patent # 6,193,949. Feb. 27, 2001. Stellflug, J.N., P.G. Hatfield, M.C. Wulster-Radcliffe, and J. Walker (2001). Reproductive performance of ewe lambs from ewes from different selection practices with or without induced estrus. Animal Reproduction Science. 66:185-193. Stellflug, J. N., M.C. Wulster-Radcliffe, E.L. Hensley, E.A. Cowardin, R.C. Seals, and G.S. Lewis (2001). Oxytocin-induced cervical dilation and cervical manipulation in sheep: Effects on laparoscopic artificial insemination. J. Anim. Sci. 79:568-573. Wulster-Radcliffe, M.C., M.A. Williams, J.N.Stellflug, and G.S. Lewis (2001). Technical note: Artificial vagina versus a vaginal collection vial for collecting semen from rams: J. Anim. Sci. 79:2964-2967. Yankey, S.J., B.A. Hicks, K.G. Carnahan, A.M. Assiri, S.J. Sinor, K. Kodali, J.N. Stellflug, and T.L. Ott (2001). Expression of the antiviral protein Mx in peripheral blood mononuclear cells of pregnant and bred, non-pregnant ewes. J. Endocrinology. v.170. p. R7-R11. Roselli, C.E., F. Stormshak, J.N. Stellflug, and J.A. Resko (2002). Relationship of serum testosterone concentrations to mate preferences in rams. Biol. Reprod. 67:263-268. Stellflug, J.N. (2002). Use of naloxone challenge to predict sexual performance of rams before the fall breeding season. Theriogenology. 58:123-134. Stellflug, J.N. (2002). Influence of classification levels of ram sexual activity on spring breeding ewes. Anim. Reprod. Sci. 70:203-214. Stellflug, J.N., and J.G. Berardinelli (2002). Ram mating behavior after long-term selection for reproductive rate in Rambouillet ewes. J. Anim. Sci. 80:2588-2593. Snowder, G.D., J.N. Stellflug, and L.D. Van Vleck (2002). Heritability and repeatability of sexual performance. J. Anim. Sci. 80:1508-1511. Stellflug, J.N. (2003). Use of naloxone challenge to predict sexual performance of young rams. J. Anim. Sci. 81:2111-2117. Roselli, C.E., K. Larkin, J.A. Resko, J.N. Stellflug, and F. Stormshak, F (2004). The volume of a sexually dimorphic nucleus in the ovine medial preoptic area/anterior hypothalamus varies with sexual partner preference. Endocrinology. 145:478-483. Stellflug, J.N., A. Perkins, and V.A. LaVoie (2004). Testosterone and luteinizing hormone responses to naloxone help predict sexual performance in rams. J. Anim. Sci. 82:3380-3387. Stellflug, J.N., N.E. Cockett, and G.S. Lewis (2005). Relationship between sexual behavior classifications of rams and lambs sired in a competitive breeding environment. J. Anim. Sci. (In Press). Stellflug, J.N., Cockett, N.E., and G.S. Lewis. The relationship between sexual behavior classifications of rams and lambs sired in a competitive breeding environment. J. Anim. Sci. 84:463-468. 2006.
|
||||||
